The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2019
Filed:
Mar. 30, 2015
Applicant:
Toray Industries, Inc., Tokyo, JP;
Inventors:
Kenji Kawamura, Kamakura, JP;
Miyuki Horiguchi, Kamakura, JP;
Satoshi Sakami, Kamakura, JP;
Katsushige Yamada, Kamakura, JP;
Assignee:
Toray Industries, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/42 (2006.01); C07C 51/43 (2006.01); C07C 51/44 (2006.01); C08G 63/06 (2006.01); C08G 63/80 (2006.01); C08G 63/08 (2006.01);
U.S. Cl.
CPC ...
C07C 51/43 (2013.01); C07C 51/44 (2013.01); C08G 63/06 (2013.01); C08G 63/08 (2013.01); C08G 63/80 (2013.01);
Abstract
A method of producing lactic acid includes subjecting a lactic acid-containing solution to distillation to collect lactic acid from the vapor side (Step A); subjecting the lactic acid obtained in Step A to crystallization (Step B); subjecting the lactic acid slurry obtained in Step B to solid-liquid separation into lactic acid crystals and a mother liquor (Step C); and circulating the mother liquor obtained in Step C to Step B (Step D).